4-Port RS-422 / 485 USB to Serial Adapter

Model No. USB-4COMi-M

RS485 to USB Adapter Auto Transmit

A 4-Port RS-422, RS-485 adapter for serial communication that utilizes four external DIP switches for easy access to the signal used. Automatic transmit and receive control for 2-wire RS-485 half-duplex mode.

  • Use your existing USB port to expand your serial communication.
  • Self-powered, with one switching power adapter 5V 2A included.
  • High-Speed Communication with 128 byte FIFO chip, works through heavy loads.
  • Industrial-grade metal housing for rugged applications.


In stock

View Volume Pricing

Units Price
1 - 4 $197.95
5 - 11 $192.01
12 - 24 $188.05
25 - 49 $184.09
50+ $178.16
USB-4COMi-M USB to 4 Port Serial Adapter
4-Port RS-422 / 485 USB to Serial Adapter


Also available from:


← Back

Sales Support

Technical Support


What Product Do You Need Help With?

When did you purchase this product?

Application Information.

What environment / application is your product used in? (Select all that apply)

What is Your Problem?

Volume Pricing

[contact-form-7 id="15753" title="Volume Pricing Form"]


Need help with a Coolgear product you’ve purchased? Get product support from our on-site engineers.

+1 (727) 209-1300
Mon - Fri: 9 AM - 5 PM EST


Contact our sales team for assistance before you buy a Coolgear product.

+1 (727) 209-1301
Mon - Fri: 9 AM - 5 PM EST

Quick Links

Resource Center
Find helpful links, articles, and learning resources.
Quotes & Volume Pricing
Contact our sales team for quotes or quantity pricing.
Returns & Claims
Begin the return process and fill out an RMA form.
Purchase Orders
Looking to place a purchase order? Learn how, here!